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// SPDX-License-Identifier: GPL-2.0-or-later
/*
* ICS backend for OPAL managed interrupts.
*
* Copyright 2011 IBM Corp.
*/
//#define DEBUG
#include <linux/types.h>
#include <linux/kernel.h>
#include <linux/irq.h>
#include <linux/smp.h>
#include <linux/interrupt.h>
#include <linux/init.h>
#include <linux/cpu.h>
#include <linux/of.h>
#include <linux/of_address.h>
#include <linux/spinlock.h>
#include <linux/msi.h>
#include <linux/list.h>
#include <asm/smp.h>
#include <asm/machdep.h>
#include <asm/irq.h>
#include <asm/errno.h>
#include <asm/xics.h>
#include <asm/opal.h>
#include <asm/firmware.h>
struct ics_native {
struct ics ics;
struct device_node *node;
void __iomem *base;
u32 ibase;
u32 icount;
};
#define to_ics_native(_ics) container_of(_ics, struct ics_native, ics)
static void __iomem *ics_native_xive(struct ics_native *in, unsigned int vec)
{
return in->base + 0x800 + ((vec - in->ibase) << 2);
}
static void ics_native_unmask_irq(struct irq_data *d)
{
unsigned int vec = (unsigned int)irqd_to_hwirq(d);
struct ics *ics = irq_data_get_irq_chip_data(d);
struct ics_native *in = to_ics_native(ics);
unsigned int server;
pr_devel("ics-native: unmask virq %d [hw 0x%x]\n", d->irq, vec);
if (vec < in->ibase || vec >= (in->ibase + in->icount))
return;
server = xics_get_irq_server(d->irq, irq_data_get_affinity_mask(d), 0);
out_be32(ics_native_xive(in, vec), (server << 8) | DEFAULT_PRIORITY);
}
static unsigned int ics_native_startup(struct irq_data *d)
{
#ifdef CONFIG_PCI_MSI
/*
* The generic MSI code returns with the interrupt disabled on the
* card, using the MSI mask bits. Firmware doesn't appear to unmask
* at that level, so we do it here by hand.
*/
if (irq_data_get_msi_desc(d))
pci_msi_unmask_irq(d);
#endif
/* unmask it */
ics_native_unmask_irq(d);
return 0;
}
static void ics_native_do_mask(struct ics_native *in, unsigned int vec)
{
out_be32(ics_native_xive(in, vec), 0xff);
}
static void ics_native_mask_irq(struct irq_data *d)
{
unsigned int vec = (unsigned int)irqd_to_hwirq(d);
struct ics *ics = irq_data_get_irq_chip_data(d);
struct ics_native *in = to_ics_native(ics);
pr_devel("ics-native: mask virq %d [hw 0x%x]\n", d->irq, vec);
if (vec < in->ibase || vec >= (in->ibase + in->icount))
return;
ics_native_do_mask(in, vec);
}
static int ics_native_set_affinity(struct irq_data *d,
const struct cpumask *cpumask,
bool force)
{
unsigned int vec = (unsigned int)irqd_to_hwirq(d);
struct ics *ics = irq_data_get_irq_chip_data(d);
struct ics_native *in = to_ics_native(ics);
int server;
u32 xive;
if (vec < in->ibase || vec >= (in->ibase + in->icount))
return -EINVAL;
server = xics_get_irq_server(d->irq, cpumask, 1);
if (server == -1) {
pr_warn("%s: No online cpus in the mask %*pb for irq %d\n",
__func__, cpumask_pr_args(cpumask), d->irq);
return -1;
}
xive = in_be32(ics_native_xive(in, vec));
xive = (xive & 0xff) | (server << 8);
out_be32(ics_native_xive(in, vec), xive);
return IRQ_SET_MASK_OK;
}
static struct irq_chip ics_native_irq_chip = {
.name = "ICS",
.irq_startup = ics_native_startup,
.irq_mask = ics_native_mask_irq,
.irq_unmask = ics_native_unmask_irq,
.irq_eoi = NULL, /* Patched at init time */
.irq_set_affinity = ics_native_set_affinity,
.irq_set_type = xics_set_irq_type,
.irq_retrigger = xics_retrigger,
};
static int ics_native_check(struct ics *ics, unsigned int hw_irq)
{
struct ics_native *in = to_ics_native(ics);
pr_devel("%s: hw_irq=0x%x\n", __func__, hw_irq);
if (hw_irq < in->ibase || hw_irq >= (in->ibase + in->icount))
return -EINVAL;
return 0;
}
static void ics_native_mask_unknown(struct ics *ics, unsigned long vec)
{
struct ics_native *in = to_ics_native(ics);
if (vec < in->ibase || vec >= (in->ibase + in->icount))
return;
ics_native_do_mask(in, vec);
}
static long ics_native_get_server(struct ics *ics, unsigned long vec)
{
struct ics_native *in = to_ics_native(ics);
u32 xive;
if (vec < in->ibase || vec >= (in->ibase + in->icount))
return -EINVAL;
xive = in_be32(ics_native_xive(in, vec));
return (xive >> 8) & 0xfff;
}
static int ics_native_host_match(struct ics *ics, struct device_node *node)
{
struct ics_native *in = to_ics_native(ics);
return in->node == node;
}
static struct ics ics_native_template = {
.check = ics_native_check,
.mask_unknown = ics_native_mask_unknown,
.get_server = ics_native_get_server,
.host_match = ics_native_host_match,
.chip = &ics_native_irq_chip,
};
static int __init ics_native_add_one(struct device_node *np)
{
struct ics_native *ics;
u32 ranges[2];
int rc, count;
ics = kzalloc(sizeof(struct ics_native), GFP_KERNEL);
if (!ics)
return -ENOMEM;
ics->node = of_node_get(np);
memcpy(&ics->ics, &ics_native_template, sizeof(struct ics));
ics->base = of_iomap(np, 0);
if (!ics->base) {
pr_err("Failed to map %pOFP\n", np);
rc = -ENOMEM;
goto fail;
}
count = of_property_count_u32_elems(np, "interrupt-ranges");
if (count < 2 || count & 1) {
pr_err("Failed to read interrupt-ranges of %pOFP\n", np);
rc = -EINVAL;
goto fail;
}
if (count > 2) {
pr_warn("ICS %pOFP has %d ranges, only one supported\n",
np, count >> 1);
}
rc = of_property_read_u32_array(np, "interrupt-ranges",
ranges, 2);
if (rc) {
pr_err("Failed to read interrupt-ranges of %pOFP\n", np);
goto fail;
}
ics->ibase = ranges[0];
ics->icount = ranges[1];
pr_info("ICS native initialized for sources %d..%d\n",
ics->ibase, ics->ibase + ics->icount - 1);
/* Register ourselves */
xics_register_ics(&ics->ics);
return 0;
fail:
of_node_put(ics->node);
kfree(ics);
return rc;
}
int __init ics_native_init(void)
{
struct device_node *ics;
bool found_one = false;
/* We need to patch our irq chip's EOI to point to the
* right ICP
*/
ics_native_irq_chip.irq_eoi = icp_ops->eoi;
/* Find native ICS in the device-tree */
for_each_compatible_node(ics, NULL, "openpower,xics-sources") {
if (ics_native_add_one(ics) == 0)
found_one = true;
}
if (found_one)
pr_info("ICS native backend registered\n");
return found_one ? 0 : -ENODEV;
}
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